Issue 10, 2021

Layer-structured FeCo bihydroxide as an ultra-stable bifunctional electrocatalyst for water splitting at high current densities

Abstract

The development of stable bifunctional electrodes capable of operation at high current densities is a key requirement for large scale hydrogen generation by water electrolysis. Herein, amorphous FeCo hydroxides are controllably electroplated onto nickel mesh to produce binder-free bifunctional FeCo-LDH/NM electrodes for water splitting. In an alkaline electrolyte, the hydrogen evolution reaction on FeCo-LDH/NM requires an overpotential of only 311 mV to deliver a current density of 1000 mA cm−2, and the same current density is achieved in the oxygen evolution reaction at 300 mV. Notably, in a real electrolyzer setup, a current density of 1000 mA cm−2 is realized at 1.82 V and remains unchanged for 150 h. The study demonstrates promising bifunctional electrocatalytic properties of the FeCo-LDH/NM electrode material making it a suitable candidate for practical applications in large-scale water electrolysis systems.

Graphical abstract: Layer-structured FeCo bihydroxide as an ultra-stable bifunctional electrocatalyst for water splitting at high current densities

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
15 Mar 2021
Accepted
12 Apr 2021
First published
19 Apr 2021

Sustainable Energy Fuels, 2021,5, 2747-2752

Layer-structured FeCo bihydroxide as an ultra-stable bifunctional electrocatalyst for water splitting at high current densities

C. Sun, H. Wang, S. Ji, X. Wang, V. Linkov, X. Tian, L. Yao, J. Zhao and R. Wang, Sustainable Energy Fuels, 2021, 5, 2747 DOI: 10.1039/D1SE00380A

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